audiopropertiespage.cpp

LINUX下的混音软件

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */

/*
    Rosegarden
    A MIDI and audio sequencer and musical notation editor.
 
    This program is Copyright 2000-2007
        Guillaume Laurent   <[e-mail]>,
        Chris Cannam        <[e-mail]>,
        Richard Bown        <[e-mail]>
 
    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
    Bown to claim authorship of this work have been asserted.
 
    Other copyrights also apply to some parts of this work.  Please
    see the AUTHORS file and individual file headers for details.
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/


#include "AudioPropertiesPage.h"

#include "misc/Strings.h"
#include "ConfigurationPage.h"
#include "document/RosegardenGUIDoc.h"
#include "gui/application/RosegardenApplication.h"
#include "gui/studio/AudioPluginManager.h"
#include "sound/AudioFileManager.h"
#include "TabbedConfigurationPage.h"
#include <kconfig.h>
#include <kdiskfreesp.h>
#include <kfiledialog.h>
#include <kfile.h>
#include <qcstring.h>
#include <qdatastream.h>
#include <qdialog.h>
#include <qframe.h>
#include <qlabel.h>
#include <qpushbutton.h>
#include <qstring.h>
#include <qtabwidget.h>
#include <qwidget.h>
#include <qlayout.h>


namespace Rosegarden
{

AudioPropertiesPage::AudioPropertiesPage(RosegardenGUIDoc *doc,
        QWidget *parent,
        const char *name)
        : TabbedConfigurationPage(doc, parent, name)
{
    AudioFileManager &afm = doc->getAudioFileManager();

    QFrame *frame = new QFrame(m_tabWidget);
    QGridLayout *layout = new QGridLayout(frame, 4, 3, 10, 5);
    layout->addWidget(new QLabel(i18n("Audio file path:"), frame), 0, 0);
    m_path = new QLabel(QString(afm.getAudioPath().c_str()), frame);
    layout->addWidget(m_path, 0, 1);

    m_changePathButton =
        new QPushButton(i18n("Choose..."), frame);

    layout->addWidget(m_changePathButton, 0, 2);

    m_diskSpace = new QLabel(frame);
    layout->addWidget(new QLabel(i18n("Disk space remaining:"), frame), 1, 0);
    layout->addWidget(m_diskSpace, 1, 1);

    m_minutesAtStereo = new QLabel(frame);
    layout->addWidget(
        new QLabel(i18n("Equivalent minutes of 16-bit stereo:"),
                   frame), 2, 0);

    layout->addWidget(m_minutesAtStereo, 2, 1, AlignCenter);

    layout->setRowStretch(3, 2);

    calculateStats();

    connect(m_changePathButton, SIGNAL(released()),
            SLOT(slotFileDialog()));

    addTab(frame, i18n("Modify audio path"));
}

void
AudioPropertiesPage::calculateStats()
{
    // This stolen from KDE libs kfile/kpropertiesdialog.cpp
    //
    QString mountPoint = KIO::findPathMountPoint(m_path->text());
    KDiskFreeSp * job = new KDiskFreeSp;
    connect(job, SIGNAL(foundMountPoint(const QString&, unsigned long, unsigned long,
                                        unsigned long)),
            this, SLOT(slotFoundMountPoint(const QString&, unsigned long, unsigned long,
                                           unsigned long)));
    job->readDF(mountPoint);
}

void
AudioPropertiesPage::slotFoundMountPoint(const QString&,
        unsigned long kBSize,
        unsigned long /*kBUsed*/,
        unsigned long kBAvail )
{
    m_diskSpace->setText(i18n("%1 out of %2 (%3% used)")
                         .arg(KIO::convertSizeFromKB(kBAvail))
                         .arg(KIO::convertSizeFromKB(kBSize))
                         .arg( 100 - (int)(100.0 * kBAvail / kBSize) ));


    AudioPluginManager *apm = m_doc->getPluginManager();

    int sampleRate = 48000;
    QCString replyType;
    QByteArray replyData;

    if (rgapp->sequencerCall("getSampleRate()", replyType, replyData)) {

        QDataStream streamIn(replyData, IO_ReadOnly);
        unsigned int result;
        streamIn >> result;
        sampleRate = result;
    }

    // Work out total bytes and divide this by the sample rate times the
    // number of channels (2) times the number of bytes per sample (2)
    // times 60 seconds.
    //
    float stereoMins = ( float(kBAvail) * 1024.0 ) /
                       ( float(sampleRate) * 2.0 * 2.0 * 60.0 );
    QString minsStr;
    minsStr.sprintf("%8.1f", stereoMins);

    m_minutesAtStereo->
    setText(QString("%1 %2 %3Hz").arg(minsStr)
            .arg(i18n("minutes at"))
            .arg(sampleRate));
}

void
AudioPropertiesPage::slotFileDialog()
{
    AudioFileManager &afm = m_doc->getAudioFileManager();

    KFileDialog *fileDialog = new KFileDialog(QString(afm.getAudioPath().c_str()),
                              QString::null,
                              this, "file dialog", true);
    fileDialog->setMode(KFile::Directory);

    connect(fileDialog, SIGNAL(fileSelected(const QString&)),
            SLOT(slotFileSelected(const QString&)));

    connect(fileDialog, SIGNAL(destroyed()),
            SLOT(slotDirectoryDialogClosed()));

    if (fileDialog->exec() == QDialog::Accepted) {
        m_path->setText(fileDialog->selectedFile());
        calculateStats();
    }
    delete fileDialog;
}

void
AudioPropertiesPage::apply()
{
    AudioFileManager &afm = m_doc->getAudioFileManager();
    QString newDir = m_path->text();

    if (!newDir.isNull()) {
        afm.setAudioPath(qstrtostr(newDir));
        m_doc->slotDocumentModified();
    }
}

}
#include "AudioPropertiesPage.moc"